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O2 sensor matter?
#11

Not getting low ect, but I did get low vat this last test around. I know it was below 50°f in the garage when I ran the test, soni know I can ignore that one.
Johnny

86 XR
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#12

Checked fuel pressure today. Had to order new gauge cuz old broke(hose) and can't find the right parts online to fab new hose. Anyhow, steady 36-38psi at KOEO. KOER with vac hose disconnected and plugged at manifold steady 40psi. Pulled vac on fpr and fuel pressure dropped at expected 1:1 ratio. Applied pressure to fpr and fuel pressure increased at expected 1:1 ratio. Shut engine off and applied vac to fpr and it holds. I let it sit for 5 min no leak down. Same on fuel pressure at rail, leaking down even after 5 min.

Next is to check wiring for vam and o2, as well as look for vac leaks. While testing manifold vac was at about 13-15 in hg. I'm at 5000ft so that's normal range.
Johnny

86 XR
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#13

(02-01-2021, 11:30 PM)Dhowland Wrote:  Get the ACT wired just to eliminate anything there. Some things I've seen in the past causing a 42 and not be O2 related. Leaking injector, bad fuel regulator( I've seen them stuck and not regulating pressure, or ruptured causing fuel to leak through the vac line),  vane air meter not reading correctly, wiring issue between ecm and O2. Idle issues and stalling during testing....your making me activate old brain cells😉, seem to remember VAM issues causing similar problems. Your throttle body and IAC aren't sludge up are they?


Still haven't wired ACT, I'll get there though. Fuel pressure and regulator good, no leaking down either, on fuel pressure or of FPR. VAM is within specs, .8 volts door closed, over 4.5 volts when door wide open. Nice and smooth too, no hiccups.

Gotta look at O2 wiring to double check it.

Thought I found a vac leak at the throttle body to upper intake. I noticed it was loose when I went to look at the IAC (DOH!). But once i fixed that up and made sure IAC, and throttle body were clean, still have code 42. Like I said still gotta check the wiring, and that's probably tomorrow along with perhaps the EGR.

I get wicked rough idle(I don't ever remember this engine being smooth, well any Lima 2.3...) but this one is so rough that it took me a few tries to get it to run with IAC disconnected, while rechecking idle speed. With IAC disconnected it hovers around 600-800 rpm. At one point it was down around 500 rpm. Service manual says to look at EGR if it stalls when hot, or cold. Engine stalls every time I pout it in neutral coming to a stop at an intersection...

Also can someone send me the diagnostic info for the thunderbird vss? I wanna see if its the same output as the XR4Ti vss.

So far when using some WD40 sprayed at all joints I can't detect any vac leaks anywhere, even before I looked at the throttle body.

Also any good ideas on how to keep exhaust out of garage when running a big hose from tail pipe to outside? I may need to quiet the car down a bit if I'm working on it during the week. Some of my neighbors apparently work from home(whose don't in 2021 right?) and I ain't spending money on a muffler till after she passes smog, and I know I'm gonna keep the car for a while.
Johnny

86 XR
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